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Someone who is so unbelievably stupid that they could not have been conceived by conventional means. Their parents went to the pet shop, bought a package of Instakid® and poured it into water and put it in the oven at 365. 3 days later they had their full grown, dumb ass kid. Similar to sea monkeys.
Person 1: Alex is always driving drunk, I don't know what's wrong with him

Person 2: Alex is an instakid man
by idddddddddk June 09, 2014
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The kid of the person you are dating that quickly becomes almost your own because you spend so much time with them outside of your dating relationship.
I am in beginning stages of dating a man with a child and I also have a child. When I go anywhere with my child it is "expected" that my instakid (the son or daughter of my boyfriend) will also join us.
by marshmallowobsessed March 26, 2013
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